Does too much insulin contribute to the cause of common obesity? Yes, almost certainly.
Here’s another high-profile study pointing to insulin’s role in obesity: Rats genetically modified to secrete less insulin from their pancreas stay slim even on a diet that makes other rats fat. Apart from the pancreatic insulin there was no difference between the slim (low insulin) and the fat (high insulin) rats.
The researchers, publishing the study in the high-impact journal Cell Metabolism, conclude that too much fat-storing insulin is a necessary cause of common diet-induced obesity (press release).
Granted, this was a study in rats. We are not rats. However, in humans the main cause of elevated insulin is eating too much carbohydrates. So it’s no coincidence that low carb diets consistently outperform other diets for weight loss.
Insulin matters. A lot.
Earlier: The #1 Cause of Obesity: Insulin